Accession Number:

ADA110901

Title:

Scattering of Focused Ultrasound in Water by Spherical Microparticles,

Descriptive Note:

Corporate Author:

UNIVERSITY OF WEST FLORIDA PENSACOLA

Personal Author(s):

Report Date:

1980-01-01

Pagination or Media Count:

19.0

Abstract:

Polluted bilge and ballast water is produced by U.S. Navy ships at a rate of more than half-a-million gallons per day. Because of environmental concerns this water must be cleaned before being returned to nature, and in order to be certain that the cleaning system is performing properly, its output needs to continually monitored. The main impurity of concern is oil, and we have determined that the oil in the cleaned water may be in the form of droplets a few microns in diameter. A paper presented at the joint meeting of the Acoustical Societies of America and Japan entitled Reflections From Microparticles in a Flowing Liquid indicated that ultrasonic procedures have the potential for detecting microparticles and discriminating between different types of microparticles by both the amplitude and the frequency dependence of the scattering. In this paper we will compare the theoretical and experimental scattering of focused ultrasound by three types of microspheres in the frequency range from 4.0 to 6.5 MHz with KA values in the range 0.2 to 1.0. The three types of microspheres we studies are 1 a spherical glass bubble 2 solid latex spheres and 3 hydrogen gas bubbles.

Subject Categories:

  • Marine Engineering
  • Test Facilities, Equipment and Methods
  • Acoustic Detection and Detectors
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE